| 摘要 |
An indexing mechanism for an optical instrument, such as a microscope, includes a support, a rotatable assembly having a plurality of detents, and a fixed member and a rotating wheel mounted to a spring. The non-rotating member is adapted to engage the detent formed in a flange on the nosepiece shell to provide positive and accurate alignment between the support and the rotatable assembly. When the rotatable assembly is rotated relative to the support, the rotating wheel engages the flange and provides for essentially friction-free rotation between detents. By insulating the spring and rotating wheel, the indexing mechanism may be used as a switch to control an electrical function of the optical instrument. |
